systemc: Adjust a warning to match Accellera.

This is to pass fix a diff in the regression tests.

Change-Id: Id1b963df647224d7a3589febe7986353a4a8e440
Reviewed-on: https://gem5-review.googlesource.com/12063
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/dt/bit/sc_bit.cc

@@ -119,7 +119,7 @@ sc_deprecated_sc_bit()
     static bool warn_sc_bit_deprecated = true;
     if (warn_sc_bit_deprecated) {
         warn_sc_bit_deprecated = false;
-        SC_REPORT_INFO("/IEEE_Std_1666/deprecated",
+        SC_REPORT_INFO("(I804) /IEEE_Std_1666/deprecated",
             "sc_bit is deprecated, use bool instead");
     }
 }